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  • Deploy Xen

    - by Marek Jelen
    I would like to deploy Xen virtualization, however I definately not sure which way to go. Citrix Xen Server has (AFAIK) better managment tools, but does not provide software raid. Ubuntu / CentOS has Xen installations and support software RAID. Is it worth to go and buy HW RAID or just stick with SW RAID and Xen budnled with linux distribution. Which way would you suggest? Are there any other things I should consider?

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  • How does Slackware handle security updates?

    - by Abtin Forouzandeh
    I use a distribution that uses apt for package management and am accustomed to letting apt grab a list of package changes. I generally let it install all the needed security updates. I've been considering migrating to slackware. However, it seems slackware does not have a package management system. How would I learn about new security updates? Is the only way to monitor http://www.slackware.com/security/?

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  • In Windows 7, clicking between file explorer windows does not generate window events. What's up?

    - by asmw
    I have a custom made global hook installed and am monitoring for window messages when file explorer windows are clicked on. The funny thing is that they don't generate any window messages! I click between two file explorer windows and nothing. No VM_CREATE, no VM_ACTIVATE. Nothing. Why is this? Spy++ crashes on my machine so I can't use it but my hook is pretty good and should pick everything up. For some reason these windows just don't function like normal windows in that they don't generate the standard window messages when they become active. It seems windows 7 does not see them as normal windows? what's going on?

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  • what is the exact difference between PHP static class and singleton class

    - by Saif Bechan
    I have always used a Singleton class for a registry object in PHP. As all Singleton classes I think the main method looks like this: class registry { public static function singleton() { if( !isset( self::$instance ) ) { self::$instance = new registry(); } return self::$instance; } public function doSomething() { echo 'something'; } } So whenever I need something of the registry class I use a function like this: registry::singleton()->doSomethine(); Now I do not understand what the difference is between creating just a normal static function. Will it create a new object if I just use a normal static class. class registry { public static function doSomething() { echo 'something'; } } Now I can just use: registry::doSomethine(); Can someone explain to me what the function is of the singleton class. I really do not understand this.

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  • signed angle between two 3d vectors with same origin within the same plane? recipe?

    - by Advanced Customer
    Was looking through the web for an answer but it seems like there is no clear recipe for it. What I need is a signed angle of rotation between two vectors Va and Vb lying within the same 3D plane and having the same origin knowing that: the plane contatining both vectors is an arbitrary and is not parallel to XY or any other of cardinal planes Vn - is a plane normal both vectors along with the normal have the same origin O = { 0, 0, 0 } Va - is a reference for measuring the left handed rotation at Vn The angle should be measured in such a way so if the plane would be XY plane the Va would stand for X axis unit vector of it. I guess I should perform a kind of coordinate space transformation by using the Va as the X-axis and the cross product of Vb and Vn as the Y-axis and then just using some 2d method like with atan2() or something. Any ideas? Formulas?

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  • Question regarding CGRectIntersectsRect and rotated rectangular image

    - by user309030
    Hi guys, I've got a long rectangular image which is rotated at different kind of angles. However the frame of the rectangular image does not rotate along with the image and instead, the rotation causes the frame to to become larger to fit the rotated image. So when I used CGRectIntersectsRect, the collision detection is totally off because the other image colliding with the rectangular image will collide before it even reaches the visible area of the rect image. In case you don't really know what I'm talking about, have a look at the ascii drawing: normal rectangular image frame, O - pixels, |, – - frame |----------| |OOOOOOOOOO| |----------| after rotation |----------| |O | | O | | O | | O | | O | | O | | O | | O | | O | |----------| I've read through some of the collision articles but all of them are talking about collision with a normal straight rectangle and what I really want is collision with a slanted image, preferably pixel collision detection. TIA for any suggestions made.

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  • Why is it I can't use my Windows installation both as a host and a guest?

    - by Josef
    I have Linux installed on my harddrive, sometimes I run it as the host operating system and sometimes run it as a guest in Windows using VirtualBox. It's a nice ability, I think. I don't think it's possible with Windows though. Is it because your average distribution includes drivers for everything known to man? Are devices/drivers configured statically in Windows so when somethings changed it breaks?

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  • The real differences between Red Hat Enterprise Linux (RHEL) and CentOS

    - by w00binda
    I know that "the vast majority of changes made (by CentOS team ndr) will be made to comply with the upstream vendor's re-distribution policies concerning trademarked names or logos" But I'm looking for a way to measure the real differences between RHEL and CentOS. My goal is to demonstrate "scientifically" that is possibile to use CentOS for development and testing purpose and use RHEL in the production environment. Any suggestion? Thanks in advance.

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  • What is this for an IP in my google app engine log file?

    - by Christian Harms
    I get many normal log lines in my google app engine application. But today I go these instead the 4-part number: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 What is this for an format? ipv6 are 6 numbers, mac address too... Normal logfile line: 187.14.44.208 - - [19/Mar/2010:14:31:35 -0700] "GET /geo_data.js HTTP/1.1" 200 776 "http://www.xxx.com.br/spl19/index.php?refid=gv_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729),gzip(gfe)" This special logfile line: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 - - [18/Mar/2010:17:00:37 -0700] "GET /geo_data.js HTTP/1.1" 500 450 "http://www.xxx.com.br/spl19/index.php?refid=cm_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 6.1; pt-PT; rv:1.9.2) Gecko/20100115 Firefox/3.6,gzip(gfe)"

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  • Odd problem with IE8 and z-index CSS property

    - by DK39
    I not been able to put one DIV over his parent DIV in Internet Explorer. With Firefox is working as suposed to. The odd part is that if I open the html file directly in IE, everything works fine. But if I upload to the server and open from there, the div is hidden underneath his parent. I've tried several z-index combinations and none works. Here's the code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Test</title> <meta http-equiv="content-type" content="text-html; charset=utf-8" /> <style type="text/css"> .col { float:left; width:310px; margin-right:13px; } .art { position:relative; border-bottom: 1px solid #d0d0d0; font: normal normal bold 11px Arial,Verdana,Helvetica; color:#A0A0A0; width:310px; height:50px; top:0px; left: 0px; margin-right:10px; background-color:#F0F0F0; } .art a { padding:3px; display:block; width:304px; height:100%; color:#707070; } .art a:visited { color:#A0A0A0; } .art a:hover { background-color:#E0E0E0; } .box { z-index:1000; background-color:#A0A0A0; color:#404040; font: normal normal bold 11px Arial,Verdana,Helvetica; display:none; position:absolute; top:30px; left:10px; text-align:left; border:3px solid #707070; margin:5px 0px 5px 5px; font-size:10px; color:White; width:100%; } </style> <script type="text/javascript"> function sh(obj) { var el = document.getElementById(obj); if ( el.style.display != 'block' ) { el.style.display = 'block'; } else { el.style.display = 'none'; } } </script> </head> <body> <div class="col"> <div class="art"> <a href="" target="_blank" onmouseover="javascript:sh('i0')" onmouseout="javascript:sh('i0')">Title 1</a> <div id="i0" class="box"> <div class="text"> Les "chemises rouges" manifestent depuis la mi-mars pour faire tomber le gouvernement et occupent depuis trois semaines un quartier touristique et commerçant autour duquel ils ont érigé des barricades. </div> </div> </div> <div class="art"> <a href="" target="_blank" onmouseover="javascript:sh('i1')" onmouseout="javascript:sh('i1')">Title2</a> <div id="i1" class="box"> <div class="text"> Une association ardéchoise accueillant des séminaires de "bien-être" et de "développement personnel" a refusé d'accueillir un stage de danse en invoquant l'homosexualité des participants, ont indiqué aujourd'hui les organisateurs. </div> </div> </div> </div> </body> </html> What's is going on here?

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  • Getting NoClassDefFoundError only with TestCases

    - by Teja
    I have one class, that creates excel sheet.For that I added poi-3.2.jar to classpath. I am working with Eclipse3.7. I have generated testcases by recording workbench actions using with WindowTester Pro. I edited generated testcase and tried to create excel sheet within that to write test result. If I use same API from normal java program (within that plugin itself), it can able to create excel file without errors. But, when I try to create from testcase, I am getting the following error: java.lang.NoClassDefFoundError: org/apache/poi/hssf/usermodel/HSSFWorkbook I have added required jar file into lib folder and added to build-path. Why its working from normal java program, but not working from WindowTester generated testcase. Could anyone help me.

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  • Tag Cloud Data Backend

    - by Waldron
    I want to be able to generate tag clouds from free text that comes from any number of different sources. For clarity, I'm not talking about how to display a tag cloud once the critical tags/phrases are already discovered, I'm hoping to be able to discover the meaningful phrases themselves... preferable on a PHP/MySQL stack. If I had to do this myself, I'd start by establishing some kind of index for words/phrases that gives a "normal" frequency for any word/phrase. eg "Constantinople" occurs once in every 1,000,000 words on average (normal frequency "0.000001"). Then as I analyze a body of text, I'd find the individual words/phrases (another challenge!), find frequencies of each within the input, and measure against the expected freqeuncy. Words that have the highest ratio against expected frequency get boosted priority in the cloud. I'd like to believe someone else has already done this, WAY better than I could hope to, but I'll be damned if I can find it. Any recommendations??

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  • UDISKS instead of HAL

    - by MeJ
    Does anybody have some expirence with udisks, because HAL won't be longer supported on the most linux distribution, so I am thinking of to use udisks for UDI in $(hal-find-by-property --key storage.bus --string usb) do HAL_TMP=`hal-get-property --udi $UDI --key storage.removable.media_available` if [ "$HAL_TMP" = "true" ]; then HAL_DEV=$(hal-get-property --udi $UDI --key block.device) HAL_SIZE=$(hal-get-property --udi $UDI --key storage.removable.media_size) HAL_TYPE=$(hal-get-property --udi $UDI --key storage.drive_type) How do I have to adapt the above mentioned commands but use udisks instead of hal Thanks!

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  • How to make the title bold?

    - by Solitaire
    Hi all, In Qmessagebox how can I make the title text bold? Here is the sample code, which I am using to disply a messagebox int ret = QMessageBox::warning(this, tr("My Application"), tr("document has been modified.\n" "Do you want to save your changes?"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel, QMessageBox::Save); I just want “tr("My Application")” to be bold, and rest to be in normal font. How can I do that? By default I am getting the normal font for both title and descriptive text. Thanks.

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  • Can a FreePBX backup be restored to a different version?

    - by Tim Long
    I run a small PBX based on the FreePBX distro of Asterisk. The installation has been steadily upgraded but for various reasons, we want to start again on a new server with a clean install from the distribution media. Will I be able to take a backup from the old server and restore it to the new server, even though the installs are different versions? How sensitive are FreePBX backups to the build version? Is it possible to get at least a partial restore?

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  • What configuration entries are changed through the graphical options interface?

    - by Shamaoke
    I use a localized version of Firefox whose options/preferences menu and about:config entries differ from the default English base distribution. When I'm discussing Firefox on international forums, it's hard to tell people what options I alter and what values I use, since the localized names are different. Is there an exhaustive list of the about:config entries that can be changed from the graphical preferences/options dialog; something I can use as a reference for translating my localized names?

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  • Rolling Apache2 log files

    - by Andrew B
    I'm using a Collabnet svn distribution on linux, and the log files are configured through the standard apache httpd.conf. It's been a while since I dealt directly with apache, but my memory and google seem to indicate that the only way to rotate apache log files is outside of apache, using a periodic script. Is there some convenient way I'm missing to rotate these?

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  • Is there any technical info about the youtube network?

    - by Allen
    I'm an IT graduate student trying to get my head around distributed content distribution systems, much like what I assume Youtube uses. I have read Google Research stuff like Bigtable and Google File System academic papers. Is there any such thing for Youtube? Can anyone point me at stuff to learn about the Youtube network and the underlying technology? thanks dbaman

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  • What are "named tuples" in Python?

    - by Denilson Sá
    Reading the changes in Python 3.1, I found something... unexpected: The sys.version_info tuple is now a named tuple: I never heard about named tuples before, and I thought elements could either be indexed by numbers (like in tuples and lists) or by keys (like in dicts). I never expected they could be indexed both ways. Thus, my questions are: What are named tuples? How to use them? Why/when should I use named tuples instead of normal tuples? Why/when should I use normal tuples instead of named tuples? Is there any kind of "named list" (a mutable version of the named tuple)?

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  • Pre-cache site as user visits

    - by strager
    I am making a static site which is 'forced' to be cached via Cache-control, etc. When a user visits my site, I want the browser to crawl my site, caching pages, so when the user navigates to a page, the load is almost instant. (I do not need a recursive crawl, as that will probably happen as the user navigates between pages. I just need to crawl the links on the current page, and of course not re-caching a page which has already been cached.) (Also, I am not changing pages using Ajax-like techniques. These are essentially normal flat HTML files with normal links.) How can I do this pre-caching using Javascript? (I am using jQuery.)

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  • Ninject caching an injected DataContext? Lifecycle Management?

    - by awrigley
    I had a series of very bizarre errors being thrown in my repositories. Row not found or changed, 1 of 2 updates failed... Nothing made sense. It was as if my DataContext instance was being cached... Nothing made sense and I was considering a career move. I then noticed that the DataContext instance was passed in using dependency injection, using Ninject (this is the first time I have used DI...). I ripped out the Dependency Injection, and all went back to normal. Instantly. So dependency injection was the issue, but I still don't know why. I am speculating that Ninject was caching the injected DataContext. Is this correct? Is there a way of configuring the lifecycle management of injected parameters? If so, what would be the best configuration to use to have the DataContext behave like a normal DataContext, ie, no caching across requests?

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  • C# Windows Service Multiple Config Files

    - by Goober
    Quick Question Is it possible to have more than 1 config file in a windows service? Or is there some way I can merge them at run time? Scenario Currently I have two config files containing the below contents. After I build and install my Windows Service, I can't get my custom XML Parser class to read the content because it keeps pointing to the wrong config file, even though I am using a few lines of code to ensure it gets the right name of the config file I need to access. ALSO When I navigate to the folder in which the service is installed, there is only sign of the normal APP.Config file, and no sign of the custom config file. (I have even set the normal ones properties to "Do Not Copy" and the custom ones properties to "Copy Always"). Config File Determination Code string settingsFile = String.Format("{0}.exe.config", System.AppDomain.CurrentDomain.BaseDirectory + Assembly.GetExecutingAssembly().GetName().Name); CUSTOM CONFIG File <?xml version="1.0" encoding="utf-8" ?> <configuration> <servers> <SV066930> <add name="Name" value = "SV066930" /> <processes> <SimonTest1> <add name="ProcessName" value="notepad.exe" /> <add name="CommandLine" value="C:\\WINDOWS\\system32\\notepad.exe C:\\WINDOWS\\Profiles\\TA2TOF1\\Desktop\\SimonTest1.txt" /> </SimonTest1> </processes> </SV066930> </servers> </configuration> NORMAL APP.CONFIG File <?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxx" /> </configSections> <connectionStrings> <add name="DB" connectionString="Data Source=etc......" /> </connectionStrings> </configuration>

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  • mdi child forms slow to draw when visibility changed

    - by dandan78
    My application has the following UI configuration: The main form is an MDI container. Its child forms are attached to a tabstrip. Each user has his set of child forms. Depending on the active user, only that user's child forms are displayed, together with tabs. This is achieved by going through the main form's MdiChildren and setting their Visible property to false/true depending on the active user. This has two undesired effects. One is that every child form gets redrawn in succession, which is ugly and slow. The other is that for some reason the forms go from maximized to normal, effectively undocking them from the main form. Is there any way to display just one of the child forms, such as the one the user was previously looking at, and get the others to stay in the background? The maximize/normal thing is not that big a deal because I can maximize them again manually.

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